Rojas, L., C. Godoy, P. Hanson and L. Hilje. 2001. A survey of homopteran species (Auchenorrhyncha) from coffee shrubs and poro and laurel trees in shaded coffee plantations, in Turrialba, Costa Rica. Revista de Biologia Tropical 49:1057-1065. Sagers, C.L. and P.D. Coley. 1995. Benefits and costs of defense in a neotropical shrub. Ecology 76:1835-1843. Schupp, E.W. 1986. Azteca protection of Cecropia: ant occupation benefits juvenile trees. Oecologia 70:379-385. Stamp, N. 2003. Out of the quagmire of plant defense hypotheses. Quarterly Review of Biology 78:23-55. Stanton, M.L., T.M. Palmer and T.P. Young. 2002. Competition-colonization trade-offs in a guild of African acacia-ants. Ecological Monographs 72:347-363. Stevens, K.L., L. Jurd and G. Manners. 1973. Alliodorin, a phenolic terpenoid from Cordia alliodora. Tetrahedron Letters 31:2955-2958. Strauss, S.Y. and A.A. Agrawal. 1999. The ecology and evolution of plant tolerance to herbivory. Trends in Ecology and Evolution 14:179-185. Tillberg, C.V. 2003. The evolution and ecology of an ant-plant symbiosis. Ph.D. Dissertation, University of Colorado, Boulder, CO. Tillberg, C.V. 2004. Friend or foe? A behavioral and stable isotopic investigation of an ant-plant symbiosis. Oecologia 140:506-515. Tokeshi, M. 1999. Species coexistence: ecological and evolutionary perspectives. Blackwell Scientific, Oxford, UK. Vasconcelos, H.L. 1993. Ant colonization ofMaieta guianensis seedlings, an Amazonian ant-plant. Oecologia 95:439-443. Vasconcelos, H.C. and A.B. Casimiro. 1997. Influence ofAzteca alfari ants on the exploitation of Cecropia trees by a leaf-cutting ant. Biotropica 29:84-92. Vasconcelos, H.L. and D.W. Davidson. 2000. Relationship between plant size and ant associates in two Amazonian ant-plants. Biotropica 32:100-111. Vanisree, M., J. Kavitha and G.V. Subbaraju. 2002. Synthesis of methyl 3-(2,4,5- trimethoxyphenyl)-propionate, an antifungal and larvicidal constituent of Cordia alliodora. Asian Journal of Chemistry 14:534-536. Wheeler, W.M. 1942. Studies of Neotropical ant-plants and their ants. Bulletin of the Museum of Comparative Zoology 90:1-262.